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Signal intensity judging method and quick gain switching method

A gain switching and signal technology, which is applied in the field of switching the gain of the sampling signal and comparing the peak value of the current or voltage signal, which can solve the problems of excessive interference signal ratio, sensitivity to external interference, and great influence on the later sampling accuracy, etc., to achieve The effect of improving sampling accuracy and improving signal-to-noise ratio

Active Publication Date: 2014-12-31
ZHUHAI PILOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the input signal is relatively weak, if a low-gain amplifier circuit is used for amplification, it will be sensitive to external interference, and the ratio of the interference signal to the actual signal is too large
Therefore, when this interference is superimposed on the signal waveform, the signal-to-noise ratio becomes relatively small, which has a great impact on the accuracy of later sampling

Method used

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  • Signal intensity judging method and quick gain switching method
  • Signal intensity judging method and quick gain switching method
  • Signal intensity judging method and quick gain switching method

Examples

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Embodiment 1

[0032] see figure 1 , figure 1 Shown is a flowchart of a method of comparing periodic signal strengths. In this embodiment, the signal strengths of the first signal y=f(x) and the second signal y=g(x) are compared, wherein the period and phase of the first signal and the second signal are the same, and different The two peaks are different.

[0033] In this embodiment, the method for comparing the peak values ​​of the first signal y=f(x) and the second signal y=g(x) mainly includes the following steps:

[0034] Step S101: Sampling the first signal y=f(x), the sampling frequency is f. Choose a reference point x close to the peak of the first signal y=f(x) 1 , preferably, you can set x 1 ∈(0,T / 4), where T is the period of the first signal. Calculate the reference point x according to the first signal y=f(x) 1 The corresponding threshold y in the first signal 1 =f(x 1 ).

[0035] Step S102: Select a second signal y=g(x), wherein the period of the second signal is T the ...

Embodiment 2

[0042] A method for fast gain switching. In the signal acquisition process, the signal needs to be properly amplified first. If the input signal strength is relatively small, it needs to be amplified by a high-gain amplifier circuit. However, when the signal is relatively strong, it needs to be amplified. The amplifying circuit with low gain is used for amplifying, and the amplifying circuit with appropriate gain is used to amplify the signal to improve the signal-to-noise ratio of the signal and improve the accuracy of the sampling signal.

[0043] Such as figure 2 and image 3 As shown, through this embodiment, it is possible to quickly judge whether the peak value of the signal meets the requirements, so as to judge whether to use the signal as the sampling signal.

[0044] Step S201: Amplify the signal with period T through the P column amplifying circuit to obtain the P column amplifying signal, wherein the gain of the Q column amplifying circuit is smaller than the gai...

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Abstract

The invention relates to a signal intensity judging method, in particular to a current or voltage signal peak value comparison method and a method of using the same for switching gains of sampled signals. The technical scheme includes that signal intensity is judging by comparing numbers larger than a set value in a certain interval of signal sampling points. Using the signal intensity judging method can quickly comparing signal intensity, and signal strength can be compared by means of quick gain switching, so that an amplifying circuit with proper gain can be selected for amplifying signals, the signal to noise ratio of the sampled signals can be increased, and sampling precision can be improved.

Description

technical field [0001] The invention relates to a method for signal magnitude, in particular to a method for comparing the peak value of a current or voltage signal and a method for switching the gain of a sampling signal by using the method. Background technique [0002] When performing current sampling, if a single-channel, fixed-gain method is used to amplify the current and then sample the current, the sensitivity to external interference signals varies due to changes in the strength of the input signal. When the input signal is relatively weak, if a low-gain amplifier circuit is used for amplification, it will be sensitive to external interference, and the ratio of the interference signal to the actual signal is too large. Therefore, when this interference is superimposed on the signal waveform, the signal-to-noise ratio becomes relatively small, which has a great impact on the accuracy of later sampling. Contents of the invention [0003] Aiming at the deficiencies ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20
Inventor 黄沛明潘国元
Owner ZHUHAI PILOT TECH